Foetal heart-beat detector
United States Patent 3187098
US Patent References:
/2001537.html
- - 2001537

/2099938.html
- - 2099938

Microphone
- - 2564562

/2777903.html
- - 2777903


Inventors:
Walter, Farrar
Lawrence, Leonard Jack
Publication Date:
06/01/1965
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Assignee:
BRUCE PEEBLES & CO LTD
Primary Class:
600/528
Other Classes:
D24/167, 73/658, 600/500, 381/67
International Classes:
A61B5/024; A61B7/04; A61B7/00